1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.awt.BorderLayout;
  25 import java.awt.Color;
  26 import java.awt.Container;
  27 import java.awt.Dimension;
  28 import java.awt.EventQueue;
  29 import java.awt.Point;
  30 import java.awt.Robot;
  31 import java.awt.event.InputEvent;
  32 import java.awt.event.MouseAdapter;
  33 import java.awt.event.MouseEvent;
  34 import java.util.concurrent.CountDownLatch;
  35 import java.util.concurrent.TimeUnit;
  36 
  37 import javax.swing.JFrame;
  38 import javax.swing.JPanel;
  39 
  40 /**
  41  * @test
  42  * @key headful
  43  * @bug 8202768
  44  * @summary we should not hang when lots of panels are used
  45  */
  46 public final class SlowPanelIteration {
  47 
  48     private static JFrame frame;
  49     private static Point center = new Point();
  50     private static volatile CountDownLatch go;
  51 
  52     public static void main(final String[] args) throws Exception {
  53         Robot r = new Robot();
  54         // accessibility tool will need time to react to our clicks
  55         r.setAutoDelay(200);
  56         try {
  57             EventQueue.invokeAndWait(SlowPanelIteration::showUI);
  58             for (int i = 0; i < 10; ++i) {
  59                 go = new CountDownLatch(1);
  60                 r.mouseMove(center.x, center.y);
  61                 r.mousePress(InputEvent.BUTTON1_DOWN_MASK);
  62                 r.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
  63                 if (!go.await(10, TimeUnit.SECONDS)) {
  64                     throw new RuntimeException("Too slow operation");
  65                 }
  66             }
  67         } finally {
  68             EventQueue.invokeAndWait(SlowPanelIteration::dispose);
  69         }
  70     }
  71 
  72     private static void showUI() {
  73         frame = new JFrame();
  74         frame.setSize(new Dimension(400, 400));
  75         frame.setLocationRelativeTo(null);
  76 
  77         final Container content = frame.getContentPane();
  78         content.setLayout(new BorderLayout(0, 0));
  79         Container lastPanel = content;
  80         for (int i = 0; i < 500; i++) {
  81             final JPanel p = new JPanel();
  82             p.setLayout(new BorderLayout(0, 0));
  83             lastPanel.add(p);
  84             lastPanel.addMouseListener(new MouseAdapter() {
  85                 @Override
  86                 public void mouseClicked(MouseEvent e) {
  87                     System.out.println("click");
  88                     go.countDown();
  89                 }
  90             });
  91             lastPanel = p;
  92         }
  93 
  94         lastPanel.setBackground(Color.GREEN);
  95         frame.setVisible(true);
  96 
  97         Point loc = frame.getLocationOnScreen();
  98         center.x = loc.x + frame.getWidth() / 2;
  99         center.y = loc.y + frame.getHeight() / 2;
 100     }
 101 
 102     private static void dispose() {
 103         if (frame != null) {
 104             frame.dispose();
 105         }
 106     }
 107 }